https://wiki.qt.io/Gallery_of_Qt_CSS_Based_Styles

https://github.com/ColinDuquesnoy/QDarkStyleSheet

• Python
  From PyPI: Get the lastest stable version of qdarkstyle package using pip (preferable):

pip install qdarkstyle

From code: Download/clone the project, go to qdarkstyle folder then:

You can use the setup script and pip install.

pip install .

Or, you can use the setup script with Python:

python setup.py install

-If PyQt5, more lines need to be changed because of its API, see the complete example

import sys
import qdarkstyle
from PyQt5 import QtWidgets

# create the application and the main window
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()

# setup stylesheet
app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())

# run
window.show()
app.exec_()